Fabrication of Al/Mg Bimetal Compound Casting by Lost Foam Technique and Liquid-Solid Process

Kerem Altug Guler; Alptekin Kisasoz; Ahmet Karaaslan

doi:10.3139/120.110624

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Fabrication of Al/Mg Bimetal Compound Casting by Lost Foam Technique and Liquid-Solid Process

Kerem Altug Guler , Alptekin Kisasoz und Ahmet Karaaslan

Veröffentlicht/Copyright: 28. September 2014

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Aus der Zeitschrift Materials Testing Band 56 Heft 9

Abstract

In the present experimental study, bimetal aluminium/magnesium macro composites which contain magnesium core were fabricated via compound casting by lost foam casting process. AM50 Mg alloy prismatic core was placed into a cubic EPS foam pattern. Conventional process steps of lost foam casting were followed and A319 casting aluminium alloy was melted and poured. Experimental studies have shown that determination of casting temperature is very important to avoid melting of Mg alloy core. Microstructures of sectioned cast specimens were observed by light microscope and scanning electron microscope (SEM). Energy dispersive X-ray spectroscopy (EDS) analysis and Brinell hardness tests were carried out. Especially, transition zone and Al/Mg interface were in the focus of research.

Kurzfassung

In der diesem Beitrag zugrunde liegenden experimentellen Studie wurden bimetallische Aluminium-Magnesium-Makrokomposite mit Magnesiumkern mittels des Lost-Foam-Gießens hergestellt. Hierzu wurde ein prismatischer Kern aus einer AM50-Mg-Legierung in einer kubischen EPS-Schaumform plaziert. Nach den konventionellen Prozessschritten des Lost-Foam-Gießens folgend, wurde eine A319-Gusslegierung geschmolzen und vergossen. Experimentelle Studien haben gezeigt, dass die Bestimmung der Gusstemperatur sehr wichtig ist, um ein Schmelzen des Magnesiumkerns zu vermeiden. Die Mikrostrukturen der geschnittenen Gussproben wurden mittels Lichtmikroskopie und Rasterelektronenmikroskopie (REM) untersucht. Außerdem wurden Energiedispersive Röntgenspektroskopie (EDS) und Brinellhärtemessungen durchgeführt. Im Fokus der Untersuchungen standen insbesondere die Übergangszone und die Al/Mg-Phasengrenze.

*Correspondence Address Assistant Prof. Dr. Kerem Altug Guler Yildiz Technical University Department of Metallurgy and Materials Engineering, Davutpasa Campus TR 34210, Esenler, Istanbul, Turkey E-mail: keremaltug@gmail.com

Alptekin Kisasoz, born in 1985, received his BSc degree in metallurgical and materials engineering from the Yildiz Technical University, Istanbul Turkey in 2008. He has been employed at the Department of Metallurgical and Materials Engineering in the Yildiz Technical University, Turkey as research assistant since 2009. He obtained the MSc degree from the same department in 2010. He is working on metal matrix composites, tool steels, and welding metallurgy.

Kerem Altug Guler, born in 1981, is assistant professor at the Yildiz Technical University, Turkey. He received his MS degree in 2005 and PhD degree in 2012 from the Yildiz Technical University, Turkey in materials science. He is working on several casting techniques like investment casting and lost foam casting, he has also research interests on metal matrix composites and cellular metals.

Prof. Dipl.-Ing. Mont. Ahmet Karaaslan, born in 1968, studied metallurgy and materials engineering from 1986 to 1990 at the Yildiz Technical University, Istanbul, Turkey, and received his doctoral degree in 1999 at the Institute for Metals Science and Materials Testing at the Montan-University in Loeben, Austria. Since 1999 he is in the section “Materials Engineering” at the Yildiz Technical University, Turkey.

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Published Online: 2014-09-28

Published in Print: 2014-09-01

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https://doi.org/10.3139/120.110624